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2 Sheets-Sheet 1.

(No Model.)

. H. KRUTZSGH.

AIR COMPRESSOR. No. 302,206. 1 I Patented July 15, 1884.

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2 Sheets-Sheet 2.

(No Model.)

H. KRUTZSGH.

AIR COMPRESSOR.

No. 302,206. Patented July 15, 1884.

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llNrrEn STATES FFKJTQ.

.ATENT HERMAN KRUTZSOH, OF ST. LOUIS, MISSOURI, ASSIGNOB OF ONE-HALF TOTHE ST. LOUIS IRON AND MACHINE \VORKS, OF SAME PLACE.

AIR-COMPRESSOR.

SPECIFICATION iorming part of Letters Patent No. 302,206, dated July 15,1884.

' Application filed March 0, 1883. so model.)

To aZZ whom it may cnccrn:

Be it known that I, HERMAN KRUTZSOH, of

St. Louis, Missouri, have madeanew and useful Improvement inAir-Compressors, of which the following is a full, clear, and exactdescription, reference being had to the annexed drawings, making part ofthis specification, in which- Figure 1 is a longitudinal section takenon the line 1 l of Fig. 3; Fig. 2, a cross-section 011 the line 2 2 ofFig. 3; Fig. 3, a plan partly in horizontal section; Fig. 4c, a verticalsection taken through the governor, and Fig. 5 a section on the line 5 5of Fig. 4:. r

The same letters denote the same parts.

The present invention relates mainly to the supply-valves of thecompressor. It also has reference to the mode of regulating thecompressor.

A, Figs. 1, '2, 3, represents an air-compressor in which the improvementis embodied. Aside from its improved features, the compressor may be ofthe usual form.

13 represents the piston. v

G 0 represent the valves for admitting the air into thecompressor-cylinder a, andD D D the discharge-valves. The peculiarity ofthe supply-valves G O is their being made in form of slides andadaptedto slide past an opening or openings in the cylinderheads a a, theslides having an opening or openings corresponding to those in thecylinder-heads, and the air being admitted into the cylinder when theslide-openings are in coincidence with the cylinder-head openings. Thebest results are obtained when the valve and cylinder have manifoldopenings, substantially as shown and more distinctly in Figs. 2 and3that is, the cylinder-heads a a each have a series of openings, a a a,and the supply-valves each have a corresponding series of openings, 0 cc, and to open the supply-valves they are moved across thecylinder-heads until the openings 0 c c are respectively brought intocoincidence with the openings a 66" a, and to close the valves they aremoved, to bring the openings 0 c 0, respectively, out of coincidencewith the openings (1 a a The aim and effect of this is to rapidly openand close the supply-valves, 50 and this is very desirable in anair-comthe governor is at m.

desired pressurein the air-receiver.

pressor, for, if practicable, theair-supply valves should worksimultaneously with the reversing of the cylinder-piston. At the momentthe piston starts on its stroke the sup ply-valve in the rear of thepistonshould be 5 5 thrown wide open and the supply-valve in front ofthe piston should be fully closed. The manifold-opening system describedprovides for obtaining this result with a minimum movement of thesupply-valves, and the remaining thing to effect is to produce theirminimum movement in the shortest practicable time. To this end thesupplyvalves are each operated by the device shown in Figs. 2, 3.

Eis the supply-valve stem. It is provided 6 5 with a friction-roller, c,and it is extended at e to work in a guide, F, and beyond the guide aspring, G, encircles the stem, the spring bearing at one end against theguide and at the other end against a shoulder, 6 upon the stem, andserving to press the valve-stem and valve to the left, as shown in Fig.2.

H represents a shaft rotating in bearings ff in the guides FF andcarrying the cams h 71. These cams operate in connection with thefricti0n-rollers e e, and their function is, by bearing against therollers, to move the valvestems and valves to the right, as shown inFig. 2. The cams are shaped, substantially as shown, to move .thevalves, when once started, in the So shortest possible time, and whenthe cams are operating the springs G G yield;but as soon as the camspass the rollers the springs act to move thevalves in the oppositedirection. The valves are preferably opened by the cams 8 5 and closedby the springs. The compressed air escapes past the dischargevalvcs D DD to .the receiver, which, being of the usual form and well understood,is not shown in the drawings. To prevent an over-pressure in thereceiver,

the latter is connected with the governor M, Figs. 4, 5. The inlet fromthe receiver into The'air passes from the inlet into the space m abovethe piston m which is attached to the rod or. This rod, including thepiston m and valve m, is balanced by means of the spring m, to suit theIf an excessive pressure exists in the air-receiver, the piston and rodm are forced downward, which movement causes the parts m m of the valvem to approach the seats m m", respectively, and thereby reduce thecurrent of steam which enters at m and when the valve is open passesthrough the passage on to the steam-engine (not shown) used in operatingthe compressor-piston. This causes the movement of the compressorpistonto slacken and the pressure in the air-receiver to fall. The pressureupon the governor-piston m then relaxes and the steam-valve m opensagain to the normal position. Should an accident occur to theair-receiver and the pressure therein be suddenly relieved, thecounter-balance m acts to lift the valve and seat the parts m m of thevalve at m m", respectively, and thereby cut off the steam passing tothe steam-engine. The valve in" works in the chamber m.

I claim 1. The combination of the air-compressor cylinder a, the ends aa of which have contrally across the face a series of openings, a a a,and the transversely-rectilinear reciprocating slide-valves O O,havingthe series of openings c c c, and the dischargevalves D, substantiallyas described.

2. In. combination with the cylinder A, the guides F F, the valves 0 O,the stems E E, the rollers e e, the springs G G, the shaft H, and thecams h h, substantially as described.

3. In an air-compressor, the combination of a cylinder in which Works apiston, and having both its heads perforated, centrally-perforated andtransversely-reciprocating valves applied to these heads, cams andsprings applied to the valve-stem for giving quick D10- tion to thevalve, and vertically-movable spring-actuated discharge-valves D in thecylinder a, all constructed and adapted to operate as described.

WVitness my hand this 22d February, 1883.

HERMAN KRUTZSOH.

Witnesses:

O. D. Moonv, CHARLES PicKLns.

